Standard Electrode Potential

Standard Electrode Potential 

Q: Why we use Platinum foil in Standard Hydrogen Electrode?

Ans:    Because hydrogen adsorbs on Platinum foil which facilitates the equilibrium between H+ from HCl solution and adsorbed H2

2H+(aq)<========> H2 (g)
Secondly, Platinum being noble metal is un-reactive and does not react with HCl.

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